BioStor
 | On the lower Silurian (Trenton) fauna of Baffin Land Charles Schuchert (1900) Proceedings of The United States National Museum 22: 143-177 |
 | New American Paleozoic Ostracoda. Preliminary revision of the Beyrichiidae, with descriptions of new genera Edward O Ulrich and Ray S Bassler (1908) Proceedings of The United States National Museum 35: 277-340 |
 | The Silurian Rocks of the Ludlow District, Shropshire C H Holland, J D Lawson and V G Walmsley (1963) Bulletin of The British Museum (Natural History) Geology 8: 93-171 |